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Palmer Computing Scale

Currency:USD Category:Antiques / Science & Medicine (Pre-1930) Start Price:10.00 USD Estimated At:250.00 - 300.00 USD
Palmer Computing Scale
Copyright entered 1843. "Palmer's Computing Scale. This is a revolving table, for solving mathematical problems", by a simple mechanical process. It consists of logarithm combination of numbers, arranged on two circles, one of whichrevolves within the other; so that, by the simple process of moving a circular card, the relation of the figures to each other is changed, so as to solve the most difficult problems. "Approx. 11" square